/*
 * Copyright (C) 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.zxing.camera;

import com.ciwong.libs.utils.DeviceUtils;

import android.content.Context;
import android.graphics.Point;
import android.graphics.Rect;
import android.hardware.Camera;
import android.hardware.Camera.Size;
import android.os.Build;
import android.os.Handler;
import android.view.SurfaceHolder;

import java.io.IOException;
import java.util.List;

/**
 * This object wraps the Camera service object and expects to be the only one
 * talking to it. The implementation encapsulates the steps needed to take
 * preview-sized images, which are used for both preview and decoding.
 */
public final class CameraManager {

    private static final String TAG = CameraManager.class.getSimpleName();

    private static CameraManager cameraManager;

    List<Size> supportPreSize;

    public static int viewTopLayoutHeight;

    public static int viewBottomLayoutHeight;

    /**
     * 预览框下面字体的高度
     */
    private int textHeight = 0;

    static final int SDK_INT; // Later we can use Build.VERSION.SDK_INT

    static {
        int sdkInt;
        try {
            sdkInt = Integer.parseInt(Build.VERSION.SDK);
        } catch (NumberFormatException nfe) {
            // Just to be safe
            sdkInt = 10000;
        }
        SDK_INT = sdkInt;
    }

    private final Context context;

    private final CameraConfigurationManager configManager;

    private Camera camera;

    private Rect framingRect;

    private Rect framingRectInPreview;

    private boolean initialized;

    private boolean previewing;

    private final boolean useOneShotPreviewCallback;

    /**
     * Preview frames are delivered here, which we pass on to the registered
     * handler. Make sure to clear the handler so it will only receive one
     * message.
     */
    private final PreviewCallback previewCallback;

    /**
     * Autofocus callbacks arrive here, and are dispatched to the Handler which
     * requested them.
     */
    private final AutoFocusCallback autoFocusCallback;

    private int mCurrentMode = CaptureMode.DEFAULT;

    private IOpenCamera mIOpenCamera;

    /**
     * 扫描模式
     */
    public class CaptureMode {
        /**
         * 二维码
         */
        public static final int QRCODE = 1;

        /**
         * 答题卡
         */
        public static final int ANSWERCARD = 2;

        /**
         * 默认模式
         */
        public static final int DEFAULT = 1;

        /**
         * 扫品牌
         */
        public static final int NEWSPAPER_BRAND = 3;

    }

    /**
     * 设置扫码模式
     *
     * @param mode {@link CaptureMode}
     */
    public void setCaptureMode(int mode) {
        mCurrentMode = mode;
        framingRectInPreview = null;
        framingRect = null;
        getFramingRectInPreview();
    }

    /**
     * 设置扫码模式
     *
     * @return {@link CaptureMode}
     */
    public int getCurrentCaptureMode() {
        return mCurrentMode;
    }

    public int getTextHeight() {
        return textHeight;
    }

    /**
     * 开启闪光灯
     */
    public void openFlash() {
        configManager.setOpenFlash(true);
    }

    public boolean getFlashState() {
        return configManager.getFlashState();
    }

    /**
     * 关闭闪关灯
     */
    public void closeFlash() {
        configManager.setOpenFlash(false);
    }

    /**
     * Initializes this static object with the Context of the calling Activity.
     *
     * @param context The Activity which wants to use the camera.
     */
    public static CameraManager init(Context context) {
        if (cameraManager == null) {
            cameraManager = new CameraManager(context);
        }
        return cameraManager;
    }

    /**
     * Gets the CameraManager singleton instance.
     *
     * @return A reference to the CameraManager singleton.
     */
    public static CameraManager get() {
        return cameraManager;
    }

    public Camera getCamera() {
        return camera;
    }

    private CameraManager(Context context) {

        this.context = context;
        this.configManager = new CameraConfigurationManager(context);

        // Camera.setOneShotPreviewCallback() has a race condition in Cupcake,
        // so we use the older
        // Camera.setPreviewCallback() on 1.5 and earlier. For Donut and later,
        // we need to use
        // the more efficient one shot callback, as the older one can swamp the
        // system and cause it
        // to run out of memory. We can't use SDK_INT because it was introduced
        // in the Donut SDK.
        // useOneShotPreviewCallback = Integer.parseInt(Build.VERSION.SDK) >
        // Build.VERSION_CODES.CUPCAKE;
        useOneShotPreviewCallback = Integer.parseInt(Build.VERSION.SDK) > 3; // 3
        // =
        // Cupcake

        previewCallback = new PreviewCallback(configManager,
                useOneShotPreviewCallback);
        autoFocusCallback = new AutoFocusCallback();
    }

    public void setIOpenCamera(IOpenCamera i) {
        mIOpenCamera = i;
    }

    public interface IOpenCamera {
        public void openCamera(Camera camera);
    }

    public byte[] getCurrentData() {
        return previewCallback.getCurrentData();
    }

    /**
     * 是否使用zxing扫码
     *
     * @param needUseZxingScan
     */
    public void setNeedUseZxingScan(boolean needUseZxingScan) {
        this.previewCallback.setNeedUseZxingScan(needUseZxingScan);
    }


    public boolean isNeedUseZxingScan() {
        return previewCallback.isNeedUseZxingScan();
    }

    /**
     * Opens the camera driver and initializes the hardware parameters.
     *
     * @param holder The surface object which the camera will draw preview frames
     *               into.
     * @throws IOException Indicates the camera driver failed to open.
     */
    public void openDriver(SurfaceHolder holder, int width, int height)
            throws IOException {
        if (camera == null) {
            camera = Camera.open();
            if (camera == null) {
                throw new IOException();
            }
            camera.setPreviewDisplay(holder);

            if (!initialized) {
                initialized = true;
                if (width > 0) {
                    configManager.initFromCameraParameters(camera, new Point(
                            width, height));
                } else {
                    configManager.initFromCameraParameters(camera, null);
                }
            }
            configManager.setDesiredCameraParameters(camera);

            // FIXME
            // SharedPreferences prefs =
            // PreferenceManager.getDefaultSharedPreferences(context);
            // �Ƿ�ʹ��ǰ��
            // if (prefs.getBoolean(PreferencesActivity.KEY_FRONT_LIGHT, false))
            // {
            // FlashlightManager.enableFlashlight();
            // }
            FlashlightManager.enableFlashlight();

            if (mIOpenCamera != null && camera != null) {
                mIOpenCamera.openCamera(camera);
            }
        }
    }

    /**
     * Closes the camera driver if still in use.
     */
    public void closeDriver() {
        if (camera != null) {
            FlashlightManager.disableFlashlight();
            camera.release();
            camera = null;
        }
    }

    /**
     * Asks the camera hardware to begin drawing preview frames to the screen.
     */
    public void startPreview() {
        if (camera != null && !previewing) {
            try {
                camera.startPreview();

            } catch (Exception e) {

                e.printStackTrace();
            }

            previewing = true;
        }
    }

    /**
     * Tells the camera to stop drawing preview frames.
     */
    public void stopPreview() {
        if (camera != null && previewing) {
            if (!useOneShotPreviewCallback) {
                camera.setPreviewCallback(null);
            }
            camera.stopPreview();
            previewCallback.setHandler(null, 0);
            autoFocusCallback.setHandler(null, 0);
            previewing = false;
        }
    }

    /**
     * A single preview frame will be returned to the handler supplied. The data
     * will arrive as byte[] in the message.obj field, with width and height
     * encoded as message.arg1 and message.arg2, respectively.
     *
     * @param handler The handler to send the message to.
     * @param message The what field of the message to be sent.
     */
    public void requestPreviewFrame(Handler handler, int message) {
        if (camera != null && previewing) {
            previewCallback.setHandler(handler, message);
            if (useOneShotPreviewCallback) {
                camera.setOneShotPreviewCallback(previewCallback);
            }
            else
            {
                camera.setPreviewCallback(previewCallback);
            }
        }
    }

    /**
     * Asks the camera hardware to perform an autofocus.
     *
     * @param handler The Handler to notify when the autofocus completes.
     * @param message The message to deliver.
     */
    public void requestAutoFocus(Handler handler, int message) {
        if (camera != null && previewing) {
            try {

                autoFocusCallback.setHandler(handler, message);
                // Log.d(TAG, "Requesting auto-focus callback");
                Camera.Parameters parameters = camera.getParameters();
                parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);
//                parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
                camera.setParameters(parameters);
                camera.autoFocus(autoFocusCallback);
            } catch (Exception e) {
                e.printStackTrace();
        }
        }
    }

    /**
     * Calculates the framing rect which the UI should draw to show the user
     * where to place the barcode. This target helps with alignment as well as
     * forces the user to hold the device far enough away to ensure the image
     * will be in focus.
     *
     * @return The rectangle to draw on screen in window coordinates.
     */
    public Rect getFramingRect() {
        Point screenResolution = configManager.getScreenResolution();
        if (camera == null || screenResolution == null) {
            return null;
        }

        int width = 0;
        int height = 0;
        int xRatio = 2;
        int yRatio = 0;
        int leftOffset = 0;
        int topOffset = 0;
        int space = DeviceUtils.dip2px(10);
        // textHeight = (int) (3.8 * space);
        int remainHeight = screenResolution.y - (viewTopLayoutHeight + space)
                * 1 - viewBottomLayoutHeight - textHeight;
        /**
         * 答题卡与二维码的预览框大小不一样所以下面要分、分别设置
         */
        if (mCurrentMode == CaptureMode.ANSWERCARD) {
            // height = (int) remainHeight;
            // width = (int) (height / 1.45);
            // yRatio = 4;
            // leftOffset = (screenResolution.x - width) / xRatio;
            // topOffset = viewTopLayoutHeight + space * 2;
//            width = (int) (screenResolution.x * 0.9f);
//            height = (int) (width * 1.45f);
//            leftOffset = (int) (screenResolution.x * 0.05f);
//            topOffset = viewTopLayoutHeight + space;
            width = screenResolution.x;
            height = screenResolution.y;
            leftOffset = 0;
            topOffset = 0;
        } else {
            width = (int) (screenResolution.x * 0.6f);
            height = (int) (screenResolution.y * 0.6f);
            yRatio = 2;
            if (width > height) {
                width = height;
            } else {
                height = width;
            }
            leftOffset = (screenResolution.x - width) / xRatio;
            topOffset = (screenResolution.y - height) / yRatio;
        }

        // leftOffset = (screenResolution.x - width) / xRatio;
        // topOffset = /* (screenResolution.y - height) / yRatio; */DeviceUtils
        // .dip2px(90);
        framingRect = new Rect(leftOffset, topOffset, leftOffset + width,
                topOffset + height);
        // }

        return framingRect;
    }

    public static Rect previewRect = new Rect();

    /**
     * Like {@link #getFramingRect} but coordinates are in terms of the preview
     * frame, not UI / screen. 最终保存在内存卡里面的答题卡大小取决于这个 rect宽和高
     */
    public Rect getFramingRectInPreview() {
        Rect tempRect = getFramingRect();
        if (tempRect == null) {
            return tempRect = new Rect();
        }
        Rect rect = new Rect(tempRect);
        Point cameraResolution = configManager.getCameraResolution();
        Point screenResolution = configManager.getScreenResolution();
        rect.left = rect.left * cameraResolution.y / screenResolution.x;
        rect.right = rect.right * cameraResolution.y / screenResolution.x;
        rect.top = rect.top * cameraResolution.x / screenResolution.y;
        rect.bottom = rect.bottom * cameraResolution.x / screenResolution.y;
        framingRectInPreview = rect;

        previewRect = framingRectInPreview;

        // }
        return framingRectInPreview;
    }

    /**
     * Converts the result points from still resolution coordinates to screen
     * coordinates.
     *
     * @param points
     *            The points returned by the Reader subclass through
     *            Result.getResultPoints().
     * @return An array of Points scaled to the size of the framing rect and
     *         offset appropriately so they can be drawn in screen coordinates.
     */
    /*
     * public Point[] convertResultPoints(ResultPoint[] points) { Rect frame =
     * getFramingRectInPreview(); int count = points.length; Point[] output =
     * new Point[count]; for (int x = 0; x < count; x++) { output[x] = new
     * Point(); output[x].x = frame.left + (int) (points[x].getX() + 0.5f);
     * output[x].y = frame.top + (int) (points[x].getY() + 0.5f); } return
     * output; }
     */

    /**
     * A factory method to build the appropriate LuminanceSource object based on
     * the format of the preview buffers, as described by Camera.Parameters.
     *
     * @param data   A preview frame.
     * @param width  The width of the image.
     * @param height The height of the image.
     * @return A PlanarYUVLuminanceSource instance.
     */
    public PlanarYUVLuminanceSource buildLuminanceSource(byte[] data,
                                                         int width, int height) {
        // Rect rect = getFramingRectInPreview();
        // int previewFormat = configManager.getPreviewFormat();
        // String previewFormatString = configManager.getPreviewFormatString();
        // switch (previewFormat)
        // {
        // // This is the standard Android format which all devices are REQUIRED
        // to
        // // support.
        // // In theory, it's the only one we should ever care about.
        // case PixelFormat.YCbCr_420_SP:
        // // This format has never been seen in the wild, but is
        // // compatible as we only care
        // // about the Y channel, so allow it.
        // case PixelFormat.YCbCr_422_SP:
        // return new PlanarYUVLuminanceSource(data, width, height,
        // rect.left, rect.top, rect.width(), rect.height(),false);
        // default:
        // // The Samsung Moment incorrectly uses this variant instead of
        // // the 'sp' version.
        // // Fortunately, it too has all the Y data up front, so we can
        // // read it.
        // if ("yuv420p".equals(previewFormatString))
        // {
        // return new PlanarYUVLuminanceSource(data, width, height,
        // rect.left, rect.top, rect.width(), rect.height(),false);
        // }
        // }
        // throw new IllegalArgumentException("Unsupported picture format: "
        // + previewFormat + '/' + previewFormatString);

        Rect rect = getFramingRectInPreview();
        if (rect == null) {
            return null;
        }
        // Go ahead and assume it's YUV rather than die.
//        return new PlanarYUVLuminanceSource(data, width, height, rect.left, rect.top, rect.width(), rect.height());
        return new PlanarYUVLuminanceSource(data, width, height, 0, 0, width, height);
    }

    public Context getContext() {
        return context;
    }

    public boolean isPreviewing() {
        return previewing;
    }

    public boolean isUseOneShotPreviewCallback() {
        return useOneShotPreviewCallback;
    }


    public PreviewCallback getPreviewCallback() {
        return previewCallback;
    }

    public AutoFocusCallback getAutoFocusCallback() {
        return autoFocusCallback;
    }

    public void setPreviewing(boolean previewing) {
        this.previewing = previewing;
    }

}
